Math Help - Statistics help regarding word prolem for blood pressure

1. Statistics help regarding word prolem for blood pressure

Suppose we have a set of blood pressures with a mean of 120 Systolic, and a sample standard deviation of 20 points. If we cannot assume a normal distribution of Systolic blood pressures, then between what two values can we be assured 99.7% of all Systolic blood pressures will lie?

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2. Originally Posted by caligirl350
Suppose we have a set of blood pressures with a mean of 120 Systolic, and a sample standard deviation of 20 points. If we cannot assume a normal distribution of Systolic blood pressures, then between what two values can we be assured 99.7% of all Systolic blood pressures will lie?

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You need to know more about the data. Otherwise you will need to use Chebyshev's inequality - Wikipedia, the free encyclopedia